Craft of steel-concrete



A. BONDE AND T. NORMAN.

CRAFT OF STEEL CONCRETE. APPLICATION FILED HAYS. 1918.

1,325,228. Patented Dec. 16,1919.

WM J7 1 cm:

UNITED STATES PATENT OFFICE.

ALFRED BONDE AND TRYGVE NORMAN, 0F CHRISTIANIA, NORWAY, ASSIGNORS, BY MESNE ASSIGNMENTS, TO JOHN MOLLAR LARSEN, OF CHICAGO, ILLINOIS.

CRAFT OF STEEL-CONCRETE.

Specification of Letters latent.

Patented Dec. 16, 1919.

To all whom it may concern:

Be it known that we, ALFRED BONDE and TRYGVE NORMAN, both subjects of the King of Norway, and residing at Ohristiania, 1n the Kingdom of Norway, have invented certain new and useful Improvements in Craft of SteelOoncrete, and do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

One of the main difliculties in the construction of large ships of reinforced concrete consists in transferring the longitudi nal stresses from the rigid vertical side walls to the horizontal deck and bottom surfaces without getting too great shearing strains along the edge of the horizontal surfaces. The side Walls in reinforced con crete ships besides their ordinary vertical beams are often also provided with cross beams from deck to bottom diagonally between the vertical beams, and according to the present invention said cross beams are continued in the deck and bottom of the ship with the same or approximately the same pitch with regard to the longitudinal axis of the ship and connected respectively with the keel beam and with the longitudinal deck beams on both sides of the cargo hold. By means of these strengthening beams, the form of which, as will be seen, approximates that of a helix, the strains transmitted from the side walls are distributed over the whole part of the horizontal surfaces covered with said ribs.

On the drawing is diagrammatically illustra-ted the application of the invention by means of a. perspective view of the frame work for a ferro concrete ship.

The numeral 1 designates the rectangular frames arranged transversely to the longitudinal axis of the hull and includes the vertical beams of the side walls. 2 is the keel beam and 3 are the longitudinal beams on both sides of the cargo hold.

On the drawing is illustrated only one hold opening but evidently two or more such openings may be present without changing the construction.

Between the vertical beams 1 in the side walls are located cross beams 4, which according to. the form illustrated on the drawing slope upwardly toward the middle of the ship. The said sloping beams 4: according to the invention continue as cross beams 5, 6 in connection with the keel beam 2 and the longitudinal deck beams 3. The ribs 4, 5, 6 in this manner form a kind of continuous helical line extending from the keel beam along the bottom and side deck of the ship.

In the form of this invention illustrated on the drawing one set of helical ribs goes backward from the keel beam in the front part of the ship, and another set goes forward from the keel beam in the rear part of the ship, but obviously there may also be used a double set of helical ribs or a single set directed in one sense along the whole length of the ship.

Claims: v

1. In a concrete ship, a keel beam, a plurality of rectangular frames arranged transversely to the keel and constituting the vertical beams of the side walls of the ships hull, longitudinal beams on both sides of the ships hold, beams between the side beams slanting toward the middle of the ship from both ends of the latter, cross beams extending from the keel beam to the lower ends of the slanting beams, and cross beams extending from the upper ends of the slanting beams to said longitudinal beams, said slanting and cross beams forming substantially helical frames extending longitudinally of the ship and embracing the bottom, sides and top thereof.

2. In a concrete ship, a keel beam, a plurality of parallel rectangular frames arranged transversely to the keel and constituting the vertical beams of the side walls of the ships hull, a rectangular frame forming the hold opening in the deck, beams between the vertical beams of the rectangular frames sloping upwardly and toward the middle of the ship from both ends thereof, cross beams extending from the keel beam to the point of connection between the vertical beams and sloping beams,

and cross beams extending from the upper as our invention, We have signed our names ends of the vertical beams and sloping in presence of tWo subscribing Witnesses. beams to the side beams of said rectangular ALFRED BONDE frame, said sloping and cross beams form- TRYGVE NORMAN 5 ing substantially helical frames extending longitudinally of the ship and embracing Witnesses: the bottom, sides, and top thereof. DAGNY Voss,

In testimony that We claim the foregoing C. NORMAN. 

